Claude Opus 5 vs Gemini 3.1 Pro Preview Custom Tools
Price and specs side by side · USD per 1M tokens · verified 2026-10-11
// side by side
| metric | Claude Opus 5 | Gemini 3.1 Pro Preview Custom Tools |
|---|---|---|
| input / 1M | $5.00 | $2.00 |
| output / 1M | $25.00 | $12.00 |
| blended (3:1) | $10.00 | $4.50 |
| cache read / 1M | $0.50 | $0.20 |
| context | 1M | 1.05M |
| max output | 128K | 65.5K |
| input types | text · image · pdf | text · image · video · audio · pdf |
| reasoning | yes | yes |
| tool calling | yes | yes |
| structured output | yes | yes |
| open weights | no | no |
| released | 2026-07-24 | 2026-02-19 |
| knowledge cutoff | 2026-05 | 2025-01 |
| lab | Anthropic |
// monthly cost scenarios
| workload | tokens in / out | Claude Opus 5 | Gemini 3.1 Pro Preview Custom Tools |
|---|---|---|---|
| Chatbot | 10M / 2M | $100 | $44.00 |
| RAG app | 50M / 5M | $375 | $160 |
| Coding agent | 20M / 10M | $350 | $160 |
// verdict
- Gemini 3.1 Pro Preview Custom Tools is 55% cheaper than Claude Opus 5 on a blended 3:1 input/output basis.
- Gemini 3.1 Pro Preview Custom Tools has the larger context window (1.05M vs 1M tokens).